Improve set comprehension for Python 3.0

uncompyle6/parsers/parse30.py

@@ -74,8 +74,8 @@ class Python30Parser(Python31Parser):
         # Need to keep LOAD_FAST as index 1
         set_comp_header  ::= BUILD_SET_0 DUP_TOP STORE_FAST
         set_comp_func ::= set_comp_header
-                          LOAD_FAST FOR_ITER store comp_iter
-                          JUMP_BACK POP_TOP JUMP_BACK RETURN_VALUE RETURN_LAST
+                          LOAD_ARG FOR_ITER store comp_iter
+                          JUMP_BACK COME_FROM POP_TOP JUMP_BACK RETURN_VALUE RETURN_LAST
 
         list_comp_header ::= BUILD_LIST_0 DUP_TOP STORE_FAST
         list_comp        ::= list_comp_header

uncompyle6/semantics/gencomp.py

@@ -465,7 +465,7 @@ class ComprehensionMixin:
             self.write(": ")
             self.preorder(n[1])
         else:
-            if self.version == (3, 0):
+            if self.version == (3, 0) and len(n) > 1:
                 body = n[1]
             else:
                 body = n[0]

uncompyle6/semantics/n_actions.py

@@ -1093,7 +1093,12 @@ class NonterminalActions:
         self.write("{")
         if node[0] in ["LOAD_SETCOMP", "LOAD_DICTCOMP"]:
             if self.version == (3, 0):
-                iter_index = 6
+                if len(node) >= 6:
+                    iter_index = 6
+                else:
+                    assert node[1].kind.startswith("MAKE_FUNCTION")
+                    iter_index = 2
+                    pass
             else:
                 iter_index = 1
             self.comprehension_walk_newer(node, iter_index=iter_index, code_index=0)